#include "stdafx.h"
#include "hnum_slu_scomplex.h"
#include "hnum_slu_mt_Cnames.h"

namespace harlinn
{
    namespace numerics
    {
        namespace SuperLU
        {
            double scsum1_(int *n, complex *cx, int *incx)
            {
            /*  -- LAPACK auxiliary routine (version 2.0) --   
                    Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   
                    Courant Institute, Argonne National Lab, and Rice University   
                    October 31, 1992   


                Purpose   
                =======   

                SCSUM1 takes the sum of the absolute values of a complex   
                vector and returns a single precision result.   

                Based on SCASUM from the Level 1 BLAS.   
                The change is to use the 'genuine' absolute value.   

                Contributed by Nick Higham for use with CLACON.   

                Arguments   
                =========   

                N       (input) INT
                        The number of elements in the vector CX.   

                CX      (input) COMPLEX array, dimension (N)   
                        The vector whose elements will be summed.   

                INCX    (input) INT
                        The spacing between successive values of CX.  INCX > 0.   

                ===================================================================== 
  


    
                Parameter adjustments Function Body */

                /* System generated locals */
                int i__1, i__2;
                float ret_val;
                /* Builtin functions */
                double c_abs(complex *);
                /* Local variables */
                static int i, nincx;
                static float stemp;


            #define CX(I) cx[(I)-1]


                ret_val = 0.f;
                stemp = 0.f;
                if (*n <= 0) {
	            return ret_val;
                }
                if (*incx == 1) {
	            goto L20;
                }

            /*     CODE FOR INCREMENT NOT EQUAL TO 1 */

                nincx = *n * *incx;
                i__1 = nincx;
                i__2 = *incx;
                for (i = 1; *incx < 0 ? i >= nincx : i <= nincx; i += *incx) {

            /*        NEXT LINE MODIFIED. */

	            stemp += c_abs(&CX(i));
            /* L10: */
                }
                ret_val = stemp;
                return ret_val;

            /*     CODE FOR INCREMENT EQUAL TO 1 */

            L20:
                i__2 = *n;
                for (i = 1; i <= *n; ++i) {

            /*        NEXT LINE MODIFIED. */

	            stemp += c_abs(&CX(i));
            /* L30: */
                }
                ret_val = stemp;
                return ret_val;

            /*     End of SCSUM1 */

            } /* scsum1_ */

        };
    };
};
